This element was discovered by W. Noddack, I. Tacke and O. Berg in 1925 in Berlin. Its name comes from the Rhine river, called Rhenium in Latin.
Ionization energies
ReI 7.9 eV, ReII 13.1 eV, ReIII 26.0 eV.
Re is not seen in the solar spectrum.
ReI was discoveredby Jaschekand Brandi (1972) in one Ap star of the Cr-Eu-Sr subgroup and in another one by Guthrie (1972).
Isotopes
Re has two stable isotopes, Re185 and Rel87, which
occur with frequencies 37% and 63% respectively in the solar
system. There exist also
18 short-lived isotopes and isomers. Re187 has a half life of
4.5 × 1010 years and can be used for radioactive dating.
Origin
Rel85 can be produced by the r process and the s process and
Re187 only by the r process.
Published in "The Behavior of Chemical Elements in Stars", Carlos Jaschek and Mercedes Jaschek, 1995, Cambridge University Press.